package com.bdqn.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 跨域访问的过滤器
 * @author jinge
 *
 */
public class CorsFilter  implements Filter  {

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
			throws IOException, ServletException {
		 HttpServletResponse response = (HttpServletResponse) servletResponse;
	        HttpServletRequest request = (HttpServletRequest)servletRequest;
	 
	        String origin = request.getHeader("Origin");
	        response.setHeader("Access-Control-Allow-Origin", origin);
	        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
	        response.setHeader("Access-Control-Max-Age", "3600");
	        response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization");
	        response.setHeader("Access-Control-Allow-Credentials", "true");
	        String method = request.getMethod();
	        if(method.equalsIgnoreCase("OPTIONS")){
	            servletResponse.getOutputStream().write("Success".getBytes("utf-8"));
	        }else{
	            filterChain.doFilter(servletRequest, servletResponse);
	        }

		
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}
